[NFC][Coroutines] Remove unused `IsImplicit` argument in maybeTailCall

[ChuanqiXu]

Summary

The argument IsImplicit in maybeTailCall is unused. I think it should be removed.

test-plan: check-llvm, check-clang

[lxfind]

Good catch. Thanks for the fix! The IsImplicit argument for buildCoawaitCalls function can also be removed now.

[ChuanqiXu]

Remove unused IsImplicit argument in buildCoawaitCalls.

[lxfind]

Thank you!

clang/lib/Sema/SemaCoroutine.cpp

 // returning await_suspend that results in a guaranteed tail call to the target
 // coroutine.
 static Expr *maybeTailCall(Sema &S, QualType RetType, Expr *E,
-                           SourceLocation Loc, bool IsImplicit) {
+                           SourceLocation Loc) {
   if (RetType->isReferenceType())
     return nullptr;
   Type const *T = RetType.getTypePtr();

 
     // Experimental support for coroutine_handle returning await_suspend.
     if (Expr *TailCallSuspend =
-            maybeTailCall(S, RetType, AwaitSuspend, Loc, IsImplicit))
+            maybeTailCall(S, RetType, AwaitSuspend, Loc))
       // Note that we don't wrap the expression with ExprWithCleanups here
       // because that might interfere with tailcall contract (e.g. inserting
       // clean up instructions in-between tailcall and return). Instead